JPS6042940A - Emergency alarm broadcast receiver - Google Patents

Abstract

PURPOSE:To adjust sound volume by an emergency alarm sound volume after reception by switching a control voltage of a sound volume control circuit with three switch circuits so as to make the sound volume constant at all times at the reception of emergency alarm. CONSTITUTION:When an emergency alarm broadcast is received at a point of time of t1, the output B of an emergency alarm broadcast decoder circuit and the level of a CLR terminal goes to ''H''. Since the level of a terminal CK goes to ''H'' with a delay by inverters 12, 13, Q, Q' are inverted at the point of time of the leading. Thus, the level of points A, C goes to ''L'', only a switch 25 is conductive, a divided voltage of resistors 20, 21 is given to a sound volume control input terminal and a maximum sound volume is outputted. In depressing an alarm confirming buttion 18 at a point of time of t2, the level of the CLR terminal goes to ''L'', the Q, Q' are inverted and hled. Thus, only a switch 24 is made conductive and the sound volume is controlled by the control of the emergency broadcast sound volume 19. When the alarm is finished at a point of time of t3, the level of the point A goes to ''H'' and a conventional voltage is fed to an F.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an emergency warning broadcast receiver in a television receiver.

Configuration of a conventional example and its problems The configuration of an emergency warning broadcast receiving section in a conventional television receiver is shown in FIG.

Power is always supplied to the tuner section, intermediate frequency amplification/detection section, and audio intermediate frequency amplification/detection section of the television receiver from a separate power source regardless of whether the television receiver's power switch is on or off, and it is possible to wait for emergency broadcast reception. is in a state of

A voice detection output is supplied to point A. This audio detection output is connected to an emergency warning broadcast decoder circuit 1, where demodulation and code discrimination of the FSX signal are performed. The output B of the emergency warning broadcast decoder circuit 1 is connected to the audio output stage power supply control circuit 2. Point D is connected to a power source produced by a flybank transformer, and a voltage is applied when the television receiver is turned on. The audio output stage power control circuit 2 takes the logical sum of B and D, generates an output C, and turns on the switch 6 when the television receiver is turned on or an emergency warning broadcast is received. Power supply H
is applied to the audio output amplification circuit 5. Audio detection output Ald
It is also connected to the volume control circuit 3.

Volume control circuit 3il-1: Volume control is performed by the DC voltage F from the volume control switching circuit 4. Volume control circuit 3
The output E from the input signal is input to the audio output amplification circuit 5. The volume control switching circuit 4 is the midpoint between the output B from the emergency warning broadcast Tecoder circuit 1, the output voltage G from the D/A converter controlled by the remote control of the television receiver, and the emergency warning volume volume 7. Switch the output voltage G
Regardless of the state, when an emergency warning broadcast is received, the circuit is configured to adjust the volume to the volume set by the emergency warning volume volume 7. I is a power supply added to the emergency warning volume volume 7. The output of the audio output circuit 5 is connected to a speaker 8.

FIG. 2 shows a detailed explanation of the volume control switching circuit 4 of the emergency warning broadcast receiving section in the television receiver having such a configuration. B is the output from the emergency warning broadcast decoder circuit 1 as described above. This B is connected to the control terminal of the analog switch 11 and the input of the inverter 9. The output of inverter 9 is connected to a control terminal of analog switch 10.

The input end of the analog switch 10 is connected to G, and the output end is connected to the input end F of the volume control circuit 3. The input end of the analog switch 11 is connected to the middle point of the emergency warning volume volume 7, and the output end is connected to the above-mentioned F. When the emergency warning broadcast is received (U and B) and in-bell, the analog switch 11 becomes conductive, the analog switch 1o becomes non-conductive, and the input F to the volume control circuit 3 becomes the voltage set by the emergency warning volume volume 7. Become. If you place it on the front of the television receiver so that the user can adjust the emergency alert volume level, it will be possible for the user to accidentally set the volume level 7 to the minimum setting and no sound will be output even if an emergency broadcast is received. It happens.

In fact, if the emergency alert volume volume 7 is installed inside the receiver, the user will not be able to adjust the volume depending on the content of the emergency alert broadcast, or will not be able to adjust the volume when testing the emergency alert broadcast receiver. It's inconvenient.

Purpose of the Invention The present invention eliminates the above-mentioned drawbacks, and makes it possible to keep the volume constant until the user confirms that the emergency broadcast has been received, and then adjust the volume using the emergency alert volume after confirmation. .

Structure of the Invention The present invention enables the control voltage of the volume control circuit using the DC voltage of the television receiver to be switched by three switch circuits, and controls the switch circuit between the output from the emergency warning broadcast receiving decoder circuit and the emergency warning broadcast receiving decoder circuit. The output of the memory circuit controlled by the alarm reception confirmation switch and the output of the memory circuit controlled by the alarm reception confirmation switch are used as the control voltage, which is the conventional volume control voltage of the television receiver, the voltage from the emergency alarm volume volume,
It is characterized by switching the voltage determined by a fixed resistor, and when receiving an emergency alarm, the volume is always constant, and after confirmation of reception, the volume is adjusted by the emergency alarm volume volume. Except for reception, the volume is controlled by the conventional volume control of a television set.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

The output B of the emergency warning broadcast Tecoder circuit is input to the input motor 12.
and one input terminal of the two-manual AND circuit 15. The other input is the emergency warning broadcast 1ft recognition switch 1.
The other end (2) of the circuit 8 is connected to the other end (2), and a circuit for preventing a chiheta 1 non-conversion consisting of a resistor 16 and a capacitor 17 is also connected to (2).

The output of the inverter 12 is the input of the inverter 13, and the output of the inverter 12 is the input of the analog switch 23.
It is also connected to the control terminal A. The output of the inverter 13 is also connected to a clock input terminal of a p-flip-flop 14 and one input terminal of a two-manual AND circuit 22. D
The input and pre-reset terminal PR is connected to the power supply I. The output terminal 1 of the two-manual AND circuit 15 is connected to the clear lhi terminal 0KFt'(.

has been done. The output terminal "lQ" of the D flip-flop 14 is connected to one control terminal of the analog switch 25. The output terminal Q is connected to the other input terminal of the two-manual AND circuit 22, and the output terminal of 22 is connected to the control terminal of the analog switch 25. The analog switches 23, 24 .
The output terminals of 25 are connected to each other and connected to the input terminal F to the volume control circuit 7].
TV receiver 1"3: Ii% which is the input of 3, the midpoint voltage of the emergency broadcast volume volume 19 which is the input of 'J'-24, and the analog switch 25 with the conventional volume control voltage G and the analog switch 25. There is a power supply voltage ■ resistor 2
It is configured to switch between voltages divided by 0.21.

Next, the operation of this circuit will be explained with reference to FIG. 11
At '1, no emergency broadcast is being received, and the output B of the emergency warning broadcast reception decoder circuit is low. Therefore, the CLR terminal is low, the Q output is high, and Q is low. Therefore, A is at a high level, A is at a low level, the analog switch 23 is conductive, and the others are non-conductive. When an emergency warning broadcast is received at time tl, B becomes high level and the CLR terminal also becomes high level. Since the CK terminal becomes high level with a delay of the passage time of the inverters 12 and 13, Q and Q are inverted at the time of rising. Therefore, one becomes high level, Aoi becomes low level, only analog switch 25 becomes conductive, and the voltage divided by resistors 20 and 21 is connected to the volume control input terminal, and the sound near the maximum volume is output. Become.

When the user confirms the broadcast content and presses the switch 18 at time t2, the CLR terminal becomes a lone bell while being pressed, and the Q
, Q is inverted. This state (is maintained even if you stop pressing the switch 18. Therefore, A becomes a high level, A and A becomes a low level, and only the analog switch 24 becomes conductive, and the emergency broadcast volume volume control 19 controls the volume. When the emergency warning broadcast ends at time t3, A becomes high level, and the conventional volume control voltage of a television receiver is supplied to F.

Effects of the Invention As described above, according to the present invention, when an emergency warning broadcast is received, the sound close to the maximum volume is forcibly output, and after the user confirms it, the emergency broadcast volume is adjusted. It is convenient because the volume is controlled so that even if the user accidentally turns down the emergency broadcast volume to the minimum and no sound is output, the emergency broadcast can be received at high volume and the user can know about the emergency situation. . Since it is independent from the conventional volume control of a television receiver, it is useful because the conventional volume control of the television receiver can be changed only when the power is not turned on.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating the configuration of a conventional emergency warning broadcast receiving section for a television receiver, FIG. 2 is a wiring diagram of a volume control switching circuit section of a conventional emergency warning broadcast receiving section, and FIG. FIG. 4 is a wiring diagram of a volume control switching circuit of an emergency warning broadcast receiver according to an embodiment of the present invention, and FIG. 4 is a timing diagram illustrating the circuit operation of the present invention. 12, l'13...Inverter, 14...D flip-flop, 15, 22...AND circuit, 2
3゜24, 25...Analog switch, 18.
...Emergency warning broadcast reception confirmation button, 19...Emergency broadcast volume volume. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3

Claims (1)

[Claims] The control voltage of the volume control circuit using the DC voltage of the television receiver can be switched by a switch circuit, and the control of this switch rotation is controlled by the output of the emergency warning broadcast reception decoder circuit, the emergency warning reception confirmation switch, and this decoder circuit. A volume control switching circuit is configured to switch between a volume control voltage, a voltage from an emergency warning volume volume, and a voltage generated by a fixed resistor, by means of a memory circuit controlled by an output from a terminal. Equipped with emergency 1st alert broadcast receiver.